"J'ai souvent entendu les gens dire ça" , the expression is 'entendre dire', to hear (someone say) when 'dire' will always be in the infinitive as it is the second verb, 'entendre' will be conjugated if required.
J'ai entendu dire que vous ne seriez pas là vendredi prochain.
(I heard that you would not be here next Friday.)
Je suis heureux de vous l'entendre dire.
(I am happy to hear you say that.)
Hope this helps!
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